Depending on the software you are using MT63 can only be used when the base frequency is 500Hz - that is MT63 tones start at 500Hz upwards.
MT63 also requires an accurately calibrated soundcard. Simon Brown, HB9DRV www.ham-radio-deluxe.com ----- Original Message ----- From: "Raymond Lunsford" <rmlunsfo...@gmail.com> > Transmitting MT-63.
